/*
* Copyright (C) 2023 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** @file
*
* EFI command line
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <ipxe/init.h>
#include <ipxe/image.h>
#include <ipxe/script.h>
#include <ipxe/efi/efi.h>
#include <ipxe/efi/efi_cmdline.h>
/** EFI command line (may not be wNUL-terminated */
const wchar_t *efi_cmdline;
/** Length of EFI command line (in bytes) */
size_t efi_cmdline_len;
/** Internal copy of the command line */
static char *efi_cmdline_copy;
/**
* Free command line image
*
* @v refcnt Reference count
*/
static void efi_cmdline_free ( struct refcnt *refcnt ) {
struct image *image = container_of ( refcnt, struct image, refcnt );
DBGC ( image, "CMDLINE freeing command line\n" );
free ( efi_cmdline_copy );
}
/** Embedded script representing the command line */
static struct image efi_cmdline_image = {
.refcnt = REF_INIT ( efi_cmdline_free ),
.name = "<CMDLINE>",
.type = &script_image_type,
};
/** Colour for debug messages */
#define colour &efi_cmdline_image
/**
* Initialise EFI command line
*
* @ret rc Return status code
*/
static int efi_cmdline_init ( void ) {
char *cmdline;
size_t len;
int rc;
/* Do nothing if no command line was specified */
if ( ! efi_cmdline_len ) {
DBGC ( colour, "CMDLINE found no command line\n" );
return 0;
}
/* Allocate ASCII copy of command line */
len = ( ( efi_cmdline_len / sizeof ( efi_cmdline[0] ) ) + 1 /* NUL */ );
efi_cmdline_copy = malloc ( len );
if ( ! efi_cmdline_copy ) {
rc = -ENOMEM;
goto err_alloc;
}
cmdline = efi_cmdline_copy;
snprintf ( cmdline, len, "%ls", efi_cmdline );
DBGC ( colour, "CMDLINE found command line \"%s\"\n", cmdline );
/* Mark command line as consumed */
efi_cmdline_len = 0;
/* Strip image name and surrounding whitespace */
while ( isspace ( *cmdline ) )
cmdline++;
while ( *cmdline && ( ! isspace ( *cmdline ) ) )
cmdline++;
while ( isspace ( *cmdline ) )
cmdline++;
DBGC ( colour, "CMDLINE using command line \"%s\"\n", cmdline );
/* Prepare and register image */
efi_cmdline_image.data = virt_to_user ( cmdline );
efi_cmdline_image.len = strlen ( cmdline );
if ( efi_cmdline_image.len &&
( ( rc = register_image ( &efi_cmdline_image ) ) != 0 ) ) {
DBGC ( colour, "CMDLINE could not register command line: %s\n",
strerror ( rc ) );
goto err_register_image;
}
/* Drop our reference to the image */
image_put ( &efi_cmdline_image );
return 0;
err_register_image:
image_put ( &efi_cmdline_image );
err_alloc:
return rc;
}
/**
* EFI command line startup function
*
*/
static void efi_cmdline_startup ( void ) {
int rc;
/* Initialise command line */
if ( ( rc = efi_cmdline_init() ) != 0 ) {
/* No way to report failure */
return;
}
}
/** Command line and initrd initialisation function */
struct startup_fn efi_cmdline_startup_fn __startup_fn ( STARTUP_NORMAL ) = {
.name = "efi_cmdline",
.startup = efi_cmdline_startup,
};
